Magneto rotor



April 12, 1932. c F. REE;

MAGNETO ROTOR Filed Aug. 8, 1930 w w Z 2 9 J Patented Apr. 12, 1932 CUB'I. FREDERICK REIS, OF

CHICAGO, ILLINOIS, ASSIGNOB T EXCEL IAGNETO CO OF CHICAGO, ILLINOIS moi arc ROTOR I Application filed August 8,, 1930. Serial No. 474,052.

The present invention relates to magnetos and has for its primary object to provide a novel rotor for such devices-which may be constructed at low cost and without sacrifice u of efliciency.

Another object of the invention resides in the provision of a magneto rotor in which the magnetic flux may be varied in different installations by a simplified construction which 19 readily admits of the variation of the number of magnets emplo ed. a

A further object o the invention consists in the use of laminations designed to increase 1 the magnetic flux on the outer surface of the 'rotor.

Other objects and advantages of the invention will be apparent from the following description when taken in connection with the accompanying drawings, in which I Figure 1 is a perspective view of a coinlete rotor with end portions of the shaft roken away.

Figure 2 is a vertical sectional view through the rotor. Figure 3 is a horizontal sectional view taken on line 33 of Figure 2; and

Figure 4 is a view similar to Figure 3 showing a slightl difierent construction of rotor in which 0 y two pole pieces are prow'ded.

Referring to the drawings in greater detail the numeral 1 indidates the shaft of the rotor which is provided with the base plate 2; these elements being integrally formed of forged steel.

The base plate 2 is provided with a plurality of sockets or countersunk portions 3 in which are seated the adjacent endsof magnets 4. These magnets are of the bar type and may have any preferred cross-sectional shape, those here shown being circular. It will be understoodthat the countersunk portions 3 will be of a shape to correspond with the crosssectional shape of the magnets;

supported and secured in position by nonmagnetic anchoring plates 5 and 6. The plate corresponding in number to the number of magnets 4 and in which the ends of the latter W are situated. The plate 6 is provided with an The opposite ends of the magnets 4 are.

5 is provided with a plurality of openings 7 internally threadedboss 8 by means of which it may be screwed into position on the shaft 1. This plate serves not only to hold the plate 5 in proper cooperative relation to the magnets 4 but also engages the adjacent ends of the magnets and thus holds their opposite ends in the countersunk portions 3 of the base plate 2. It thus appears that a very simple and inexpensive means is provided for assembling and anchoring in spaced relation the magnets of a rotor, which means is strong and durable and extremely unlikely to become disarranged.

The magnets in the embodiment of the invention shown in Figures 1, 2 and 3 are arranged in groups of three, one group of magnets having all of their north poles at one end of the rotor, while the other group has all south poles at the same end of the rotor. It will be apparent, of course, that the number of magnets in each group may be increased or decreased in accordance with the desired amount of magnetic flux in the rotor.

I For the purpose of reducing eddy currents and. increasing the permeability of the magnetic field, the magnets 4 are provided with laminated pole pieces of softiron or steel and in this regard the present invention is a modification of the rotor disclosed in my Patent N 0. 1,726,042, granted August 27, 1929, for rotor for magnetos. In the present construction the laminations which are indicated by the numeral 9 are of arcuate shape and are each provided with three apertures to receive the three magnets 4 ofthe particular group, there being a stack of laminations for each group. Each stack of laminations 9 serves to tie together the magnet ends of like polarity and also aid in producing a cumulative effect of the magnets of each group.

It is desirable, of course, to secure the great est amount of magnetic flux on the exterior of the rotor, and to'this end the laminations are provided with the notches 10 extending betweenthe magnets 4 toward the outer peri hery of the arcuate laminations.

n the modified construction shown in Figure 4, only two magnets 11 are employed and the laminations 12 are provided with inner cut-out portions 13 similar to the cut-out ortions 10 of the construction shown in igures 1, 2 and 3. Inother respects the rotor shown in Figure 4 is identical with that heretofore described.

From the foregoing description taken in connection with. the accompanying drawings it will be apparent to those skilled in the art that I have devised a magneto rotor of simple and inexpensive construction; that it is so designed as to permit of its" being assembled with a varying number of magnets in accordance with the amount of magnetic flux desired; that the laminations are constructed to tie together the magnets of each group and provide a cumulative effect of the magnets; and that the laminations are so shaped as to create a maximum amount of magnetic flux on their exterior surfaces.

In accordance with the patent statutes I have described what I now consider the preferred form of the invention, but obviously minor changes may be made in the details of construction without departing from the spirit of the invention, and such changes or alterations are intended to be included within the scope of the appended claims.

What I claim is:

l. A rotor for magnetos including an integral shaft and base plate of forged steel, said plate provided /with countersunk porpiece rotor shaft and base plate, said base plate having spaced recesses in one of its faces, a plurality of permanent magnets seated in the recesses in the baseplate, and a non-magnetic anchoring plate threaded onto said shaft and engaging the ends of said tions on the inner face thereof, permanent magnets each having one end positioned in a countersunk portion of the base plate, and means threaded to the shaft for holding said magnets in the countersunk portions.

2. A rotor for magnetos includingan inte- V gral shaft and base plate, a plurality of perm ent magnets, means on said base plate for supporting the adjacent ends ofthe magnets, an anchoring plate provided with cut-out portions to receive the opposite ends of said magnets, and a plate threaded to said shaft for securing the anchoring plate in position.

3. A rotor for magnetos including a shaft, a plurality of permanent magnets, means for spacing said magnets about said shaft in groups of two or more with the like oles in adjacent relation, laminations of so t metal. encircling and tyingtogether the magnet ends of each group, and a securing plate thread- .ed on said shaft and engaging the magnet ends adjacent the laminations.

4. A rotor for magnetos including a shaft, a plurality of permanent magnets, means for spacing said magnets about said shaft in groups of two or more, and laminations of soft metal provided with openings corresponding in number to the number of mag nets in each group, said laminations being threaded over and tying together like poles of the magnets of each group, and an anchoripg plate threaded onto said shaft and the ends of the magnets. e, A. rormagnetos comprising a one- 

